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Share Capital, Option Plans and Share-Based Payments (Share-Based Payments) (Details) - USD ($)
$ in Thousands
12 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2014
Share-based Compensation Arrangement By Share-based Payment Award [Line Items]      
Share-based compensation expense $ 25,978 $ 22,047 $ 19,906
Stock Options      
Share-based Compensation Arrangement By Share-based Payment Award [Line Items]      
Share-based compensation expense 13,202 12,193 7,883
Restricted Stock Units (RSUs fully vested)      
Share-based Compensation Arrangement By Share-based Payment Award [Line Items]      
Share-based compensation expense 0 0 3,300
Deferred Stock Units (Directors)      
Share-based Compensation Arrangement By Share-based Payment Award [Line Items]      
Share-based compensation expense 2,764 2,038 1,548
Long Term Incentive Plan | Performance Stock Units (PSUs)      
Share-based Compensation Arrangement By Share-based Payment Award [Line Items]      
Share-based compensation expense 2,688 2,287 4,643
Long Term Incentive Plan | Restricted Stock Units (RSUs)      
Share-based Compensation Arrangement By Share-based Payment Award [Line Items]      
Share-based compensation expense 5,086 4,574 2,062
Other plans | Restricted Stock Units (RSUs)      
Share-based Compensation Arrangement By Share-based Payment Award [Line Items]      
Share-based compensation expense 1,573 955 470
Employee Share Purchase Plan      
Share-based Compensation Arrangement By Share-based Payment Award [Line Items]      
Share-based compensation expense $ 665 $ 0 $ 0